Apparatus for grinding or surfacing calender-bowls and the like.



PATEN'IED MAY 21; 1907.

J. DRONSFIBLD. APPARATUS FOR GRINDING 0R SURFACING GALENDER BOWLS AND THE LIKE.

urucnxon FILED DEG. 26. 1906.

4 SHEETS-SHEET 1.

INVENTOR,

WITNESSES.

n4: NORRIS PETERS ca IIIJHINUNN, nt 116.854.3 41. PATENTEDMAY 21, 19 07. J. DRONSFIELD APPARATUS 110 GRINDING QR SURFAGING GALENDEB. BOWLSAND THE LIKE.

APPLICATION FILED DEC. 28, 1906- 4 SHEETS-SHEET 2-.

INVIENTOR gm/meg, prom? 0141 g mstom W WITNESSES ml NORRIS PETERS cm, iusnmawu. b. c.

'PATENTB'D MAY 21,1 190?.

' J. DRONSFIBLD. APPARATUS'FOR GRINDING OR SURFAGING GALENDER BOWLS AND THE LIKE.

APPLIOATIOR FILED DEG. 26, 1906.

4 SHBETBSHEET 3.

WITN ESSES,

jiykisgdftorwevs No. 854,341. v PATEN'IED MAY 21, 1907. I J. DRONSFIELD. APPARATUS FOR GRINDING 0R SURFAGING GALENDER BOWLS AND THE LIKE.

APPLICATION IILEDDBO. 26, 1906' r 4 SHEETS-SHEET 4.

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THE NORRIS PETERS ca, wAsmfiumN. D c.

UNITED STATES FATENT OFFICE.

JAMES DRONSFIELD, OF QLDI'IALI, ENGLAND.

APPARATUS FOR GRINDING OR SURFACING CALENDER-BOWLS AND THE LlKE.

No. 854,3d1.

Specification of Letters Patent.

Patented May 21, 1907.

Application filed December 26,1906. Serial No. 349,5 76.

T0 aZZ whom it may concern.-

Be it known that I, JAMES DRONSFIELD, of the firm of Dronsfield Brothers Limited, of the Atlas Works, Oldham, in the county of Lancaster, England, card-grinding machine makers, a subject of Great Britain, residing at Oldham, in the county of Lancaster, England, have invented new and useful Improvements in Apparatus for Grinding or Surfacing Calender-Bowls and the Like, of which the following is a specification.

This invention relates to an apparatus for grinding calender bowls and like heavy rollers.

The machine and its details is illustrated in the attached four sheets of drawings where- 1n:

Figure 1 is a front elevation of the apparatus partly in section and broken in length. Fig. 2 is an end elevation on a smaller scale. Fig. 3shows a detail section of one of the removable bushes. Fig. 4 is an enlarged seetional view indicating the means used for supporting and adjusting the calender bowl to be ground. Figs. 5 and 6 are detail views of the left hand. portion of the guide and guard for the grinder. Fig. 7 is a detail indication of a butterfly which is a well known element.

In my improved apparatus I use a traversing grinder Gr which reciprocates across the width of the machine and this grinder moves between two brackets a a fixed upon standards a a of a suitable design, which standards and brackets sustain all the working parts. The grinder is traversed by varying the relative speed of a shell and a screwed shaft by the shifting of a band from pulleys of varying diameter by the endwise movement of a shaft mounted in bearings.

In the present case I mount a boss (I 011 a shell I) inclosing a screw-threaded spindle c the shell and spindle being supported in the end brackets a a in such a manner that each can be independently rotated. The boss (1 moves endwise and is clamped between the two parts a e of the grinder shifter and guard which two parts are secured together by bolts and nuts or studs 6 The two parts 6 e of the grinder guard, embrace the grinder G, as shownin Fig. 1, the grinder in the present case being mounted on a separate shell f immediately below the traversing screw shell 6. The shell for the grinder G, or rather its axle, is supported in bearings in the end brackets a, a and to facilitate fitting or removal I provide such brackets with short bushes or sleeves 9 having a milled or other flange 9 one bush or sleeve being preferably used at each end and inserted from the outside of each bracket. By first removing the pulleys, and slackening back the set-screw 9 then one or other of the bushes or sleeves 9 may be withdrawn whereuponthe grinder shell f can be pushed end-on and more readily removed. In a reverse manner it may be just as easily got into position by passing it endwise through the brackets a and replacing or securing the bush or sleeve 9. The sleeve or bush is separately shown in Fig. 3. I may as shown fix each bush or sleeve in position by a pinching screw 9 The described way of removing the shell f by passing same out endwise through the brackets is very useful in permitting a ready change of grinder G being made which is desirable it being only necessary to withdraw the shell f from the grinder slacken back the nuts 6 e to release the grinder, whereupon the same may be changed.

Above the first mentioned shell I) and screw-threaded. spindle c, or in other suitable position, I mount a shaft h free to move in bearings and carrying adjustable stops h, h, and a belt-fork 7L2. The lower extremity of the belt-fork 72/ is guided on a fixed spindle 7L3. Arms or projections e e from the traversing boss, or its frame-work, act on said stops h h as the grinder g is traversed. The shell I; of the traversing device carries a pulley b and the screw-threaded spindle has pulleys c c of varying diameter.

Toward the base of the machine is the main shaft 41 and from this shaft t the shell f for the grinder G is driven as for instance by an open strap i at one end of the machine said strap connecting the pulleys 17 f.. At the other end of the machine, a pulley on the main shaft i drives the pulley b of the shell I) of the traversing device by means of an open band j, while a belt j also passes to one of the differential pulleys c a being guided over a slidable flanged pulley 7:: on the grinder shell shaft, said belt being tensioned by a jockey pulley Z carried on a weighted lever arm Z pivoted at Z to the end standard. As the grinder G traverses to' and fro, the shaft h carrying the stops h h is reciprocated and the belt-fork 72/. acting on the belt 5' shifts same from one pulley to another as will be understood and so varies the relative speed of the shell and screwed shaft. The usual butterfly or butterflies (represented in a diagrammatic form in Fig. 7 and marked 2, 2,) passes through the shell I) and engages the screw shaft as is well known.

It is a necessary part of the apparatus that it should carry means to support the calender bowl to be ground and for this purpose the end standards a a project at the base to the front of the machine, as is seen. in Fig. 2, and are formed with, or have attached thereto, a bed m which extends from end to end. This bed, supports two main carriages or bearers n n which are adjustable endwise of the machine so that said carriages can be set closer together, or moved apart, to accommodate bowls of varying lengths. These carriages n n engage and slide along the bed m, and bolts 0 or other fastening means, are provided for securing same in any adjusted position. Upon each of said carriages n a a slide p is mounted, adjustable toward or from the grinder, and these slides have a screwed base piece or nut p formed on or attached thereto with which a screwed shaft q mounted in each carriage engages. These screwed shafts have their extremities firmly mounted in bearings n and carry handles or hand wheels 9' by actuating which the slides p can be set-up or adjusted. If desired micrometer dials or graduated indicators 6" (see Figs. 2, 4 and 4) may lee secured to the screwed shafts, or to lock-nuts or parts carried thereby, and work to an indicator 1", or to a pointer or mark. Conveniently I might divide the dial or indicator 7* into 125 divisions and cut a screw thread inch pitch on the shaft g by which plan each graduation would represent one thousandth part of an inch. In working with. such micrometer dials, the slides 79 p can be set up in perfect unison and with absolute accuracy so that greater uniformity in the grinding results.

The adjustable slides 19 are each provided with or have secured thereto an upwardly projecting arm or jaw p and a further arm or crutch p is adjustably fitted on each slide and connected by a bolt movable in a slot 1%. Between these arms 1) and adjustable crutches p" the trunnions or shafts of the bowls are dropped and the adjustability of the second arm or crutch p in each case is to accommodate variations in the diameter of the trunnions or shafts of the bowls.

The main slides 11 preferably carry packingpieces 8 which when required. serve to raise up the bowl somewhat so as to cause its center to more or less coincide with the center of the grinding disk. In any case these packing-pieces take the wear and can be reversed or renewed, the wear being upon such packing-pieces and the crutches p p as is ob vious. These packing-pieces s, which are of various thicknesses as represented, may have holes 8 which engage projections s from the slides, by which engagement the packingpieces are firmly held in position. As one of various modifications for this purpose the packing-pieces of various thicknesses may have projections which would engage holes or slots in the slides. The calender bowl, which is lettered A and indicated in full lines in Fig. 2 and in dotted lines in Figs. 1 and 4, is driven in any convenient manner as for example it may be fitted with a removable chain wheel 15 driven by a chain i from a chain wheel t on the main shaft i.

The apparatus described, forms a useful and compact combination of parts very suitable for the purpose and will accommodate bowls of varying lengths and diameter, as well as bowls of various lengths and diameter of bowl shaft or axle, while the grinding effect can be controlled and kept uniform by the setting-up or regulating index on each car riage, and the grinding confined to any stretch by adjusting the stops h h on the sliding shaft.

I declare that what I claim is 1. In bowl grinding machines, a grinder, a supporting shell therefor, a screwed spindle, a sleeve surrounding same, differential sized pulleys for said screwed. spindle and sleeve, a belt shifting means, a main bed, brackets adjustable along said bed, slides on said brackets, trunnion holding means on said slides, adjusting screws for the independent adj ustment of said slides and trunnion holding means, whereby said bowl may be set-up to the grinder, and micrometer dials 'r and an indicator for setting said dials to, substan tially as described.

2. In a bowl grinding machine, a grinder, a supporting shell therefor, a screwed spindle, a sleeve surrounding same, strap shifting mechanism, a main bed, brackets adjustable along said bed, slides on said brackets, trunnion holding means on said slides, independent adjusting devices for advancing the bowl to be ground, comprising screws and indicating dials thereon, and removable packing pieces .9, packing-up said bowl trunnions, substantially as described.

3. In combination in a bowl grinding machine, a traversing grinder, a removable shell for same, removable bushes or sleeves, a traveling boss, a shell, a screwed spindle, differential sized pulleys therefor, adjustable bowl supporting means comprising a main bed, slides thereon, trunnion holding means, screws for adjusting said slides, dials on said screws, and packing pieces 8 for setting-up the trunnions.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JAMES DRONSFIELD.

WVitnesses:

RICHARD IBBERSON,

ALFRED Yarns 

